Package io.druid.server.coordinator

Examples of io.druid.server.coordinator.BalancerStrategy

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  @Override
  public DruidCoordinatorRuntimeParams run(DruidCoordinatorRuntimeParams params)
  {
    final CoordinatorStats stats = new CoordinatorStats();
    final DateTime referenceTimestamp = params.getBalancerReferenceTimestamp();
    final BalancerStrategy strategy = params.getBalancerStrategyFactory().createBalancerStrategy(referenceTimestamp);
    final int maxSegmentsToMove = params.getCoordinatorDynamicConfig().getMaxSegmentsToMove();

    for (Map.Entry<String, MinMaxPriorityQueue<ServerHolder>> entry :
        params.getDruidCluster().getCluster().entrySet()) {
      String tier = entry.getKey();

      if (currentlyMovingSegments.get(tier) == null) {
        currentlyMovingSegments.put(tier, new ConcurrentHashMap<String, BalancerSegmentHolder>());
      }

      if (!currentlyMovingSegments.get(tier).isEmpty()) {
        reduceLifetimes(tier);
        log.info("[%s]: Still waiting on %,d segments to be moved", tier, currentlyMovingSegments.size());
        continue;
      }

      final List<ServerHolder> serverHolderList = Lists.newArrayList(entry.getValue());

      if (serverHolderList.size() <= 1) {
        log.info("[%s]: One or fewer servers found.  Cannot balance.", tier);
        continue;
      }

      int numSegments = 0;
      for (ServerHolder server : serverHolderList) {
        numSegments += server.getServer().getSegments().size();
      }

      if (numSegments == 0) {
        log.info("No segments found.  Cannot balance.");
        continue;
      }

      for (int iter = 0; iter < maxSegmentsToMove; iter++) {
        final BalancerSegmentHolder segmentToMove = strategy.pickSegmentToMove(serverHolderList);

        if (segmentToMove != null && params.getAvailableSegments().contains(segmentToMove.getSegment())) {
          final ServerHolder holder = strategy.findNewSegmentHomeBalancer(segmentToMove.getSegment(), serverHolderList);

          if (holder != null) {
            moveSegment(segmentToMove, holder.getServer(), params);
          }
        }
      }
      stats.addToTieredStat("movedCount", tier, currentlyMovingSegments.get(tier).size());
      if (params.getCoordinatorDynamicConfig().emitBalancingStats()) {
        strategy.emitStats(tier, stats, serverHolderList);

      }
      log.info(
          "[%s]: Segments Moved: [%d]", tier, currentlyMovingSegments.get(tier).size()
      );
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        return stats;
      }

      final List<ServerHolder> serverHolderList = Lists.newArrayList(serverQueue);
      final DateTime referenceTimestamp = params.getBalancerReferenceTimestamp();
      final BalancerStrategy strategy = params.getBalancerStrategyFactory().createBalancerStrategy(referenceTimestamp);
      if (availableSegments.contains(segment)) {
        CoordinatorStats assignStats = assign(
            params.getReplicationManager(),
            tier,
            totalReplicantsInCluster,
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  {
    setupDummyCluster(10, 20);
    DataSegment segment = getSegment(1000);

    final DateTime referenceTimestamp = new DateTime("2014-01-01");
    BalancerStrategy strategy = new CostBalancerStrategy(referenceTimestamp, 4);
    ServerHolder holder = strategy.findNewSegmentHomeReplicator(segment, serverHolderList);
    Assert.assertNotNull("Should be able to find a place for new segment!!", holder);
    Assert.assertEquals("Best Server should be BEST_SERVER", "BEST_SERVER", holder.getServer().getName());
  }
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  {
    setupDummyCluster(10, 20);
    DataSegment segment = getSegment(1000);

    final DateTime referenceTimestamp = new DateTime("2014-01-01");
    BalancerStrategy strategy = new CostBalancerStrategy(referenceTimestamp, 1);
    ServerHolder holder = strategy.findNewSegmentHomeReplicator(segment, serverHolderList);
    Assert.assertNotNull("Should be able to find a place for new segment!!", holder);
    Assert.assertEquals("Best Server should be BEST_SERVER", "BEST_SERVER", holder.getServer().getName());
  }
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  public void testBenchmark() throws InterruptedException
  {
    setupDummyCluster(100, 500);
    DataSegment segment = getSegment(1000);

    BalancerStrategy singleThreadStrategy = new CostBalancerStrategy(DateTime.now(DateTimeZone.UTC), 1);
    long start = System.currentTimeMillis();
    singleThreadStrategy.findNewSegmentHomeReplicator(segment, serverHolderList);
    long end = System.currentTimeMillis();
    long latencySingleThread = end - start;

    BalancerStrategy strategy = new CostBalancerStrategy(DateTime.now(DateTimeZone.UTC), 4);
    start = System.currentTimeMillis();
    strategy.findNewSegmentHomeReplicator(segment, serverHolderList);
    end = System.currentTimeMillis();
    long latencyMultiThread = end - start;

    System.err.println("Latency - Single Threaded (ms): " + latencySingleThread);
    System.err.println("Latency - Multi Threaded (ms): " + latencyMultiThread);
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Related Classes of io.druid.server.coordinator.BalancerStrategy

  • io.druid.server.coordination.CostBalancerStrategyTest
  • io.druid.server.coordinator.helper.DruidCoordinatorBalancer
  • io.druid.server.coordinator.rules.LoadRule
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